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Abstract

A three-dimensional (3-D) optical image-recognition technique
is proposed and studied. The proposed technique is based on
two-pupil optical heterodyne scanning and is capable of performing 3-D
image recognition. A hologram of the 3-D reference object is first
created and then is used to modulate spatially one of the pupils of the
optical system; the other pupil is a point source. A 3-D target
object to be recognized is then scanned in two dimensions by optical
beams modulated by the two pupils. The result of the
two-dimensional scan pattern effectively displays the correlation of
the holographic information of the 3-D reference object and that of the
3-D target object. A strong correlation peak results if the two
pieces of the holographic information are matched. We analyze the
proposed technique and thereby lay a theoretical foundation for optical
implementations of the idea. Finally, computer simulations are
performed to verify the proposed idea.

References

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